There are two ways to center one
UIView inside another, depending on whether you use Auto Layout.
If you don’t use Auto Layout, it’s only one line of code:
child.center = parent.center
That sets the position once, so it won’t update when your user rotates their device or if they use something like Slide Over to change the size of your app.
If you’re using Auto Layout, you can center your child view inside its parent like this:
child.centerXAnchor.constraint(equalTo: parent.centerXAnchor).isActive = true child.centerYAnchor.constraint(equalTo: parent.centerYAnchor).isActive = true
Those constraints will automatically update as the available space changes.
Available from iOS 3.2
Did this solution work for you? Please pass it on!
Other people are reading…
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Want to build macOS apps?
Hacking with macOS delivers 18 awesome projects that teach you macOS development in no time – take control of your desktop today!